/* fix-encoding demo — own lightweight brand. No external fonts, no CDN.
   Light + dark themes via prefers-color-scheme AND an explicit [data-theme]
   override set by the toggle. All colours are CSS variables so the two themes
   stay in sync. System fonts only. */

:root {
  --bg: #f4f6fb;
  --panel: #ffffff;
  --panel-2: #f7f9fc;
  --ink: #16202e;
  --ink-soft: #4a5768;
  --ink-faint: #7a8697;
  --border: #dde3ec;
  --accent: #0e8f80;
  --accent-ink: #0a6a5f;
  --code-bg: #f0f3f8;

  --good-bg: #e5f6ee; --good-ink: #0c6b4b; --good-border: #9fdcc0;
  --caution-bg: #fdf3e2; --caution-ink: #8a5a12; --caution-border: #f0cf95;
  --clean-bg: #e9f0fb; --clean-ink: #29527f; --clean-border: #b7cdec;
  --empty-bg: #eef1f6; --empty-ink: #5a6676; --empty-border: #d5dce6;

  --radius: 14px;
  --mono: ui-monospace, "SFMono-Regular", "Menlo", "Consolas", monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0e1420;
    --panel: #18202e;
    --panel-2: #141b27;
    --ink: #eaf0f8;
    --ink-soft: #aeb9c8;
    --ink-faint: #7d8a9c;
    --border: #2a3547;
    --accent: #35c9b6;
    --accent-ink: #6fe0d0;
    --code-bg: #101724;

    --good-bg: #10382c; --good-ink: #7fe6bf; --good-border: #245c48;
    --caution-bg: #3a2c14; --caution-ink: #f2c887; --caution-border: #6a5227;
    --clean-bg: #17293f; --clean-ink: #9dc2ee; --clean-border: #2f4a6b;
    --empty-bg: #161e2b; --empty-ink: #9aa6b6; --empty-border: #2a3547;
  }
}

/* Explicit override from the toggle (wins over the media query). */
:root[data-theme="dark"] {
  --bg: #0e1420;
  --panel: #18202e;
  --panel-2: #141b27;
  --ink: #eaf0f8;
  --ink-soft: #aeb9c8;
  --ink-faint: #7d8a9c;
  --border: #2a3547;
  --accent: #35c9b6;
  --accent-ink: #6fe0d0;
  --code-bg: #101724;
  --good-bg: #10382c; --good-ink: #7fe6bf; --good-border: #245c48;
  --caution-bg: #3a2c14; --caution-ink: #f2c887; --caution-border: #6a5227;
  --clean-bg: #17293f; --clean-ink: #9dc2ee; --clean-border: #2f4a6b;
  --empty-bg: #161e2b; --empty-ink: #9aa6b6; --empty-border: #2a3547;
}

* { box-sizing: border-box; }

html, body { margin: 0; }

body {
  font-family: var(--sans);
  background:
    radial-gradient(1100px 480px at 82% -8%, color-mix(in srgb, var(--accent) 12%, transparent), transparent 60%),
    var(--bg);
  color: var(--ink);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  line-height: 1.5;
}

/* ---- Top bar ---- */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 16px clamp(16px, 4vw, 40px);
  max-width: 1180px;
  margin: 0 auto;
}
.brand { display: flex; align-items: center; gap: 12px; }
.logo {
  font-family: var(--mono);
  font-weight: 700;
  font-size: 18px;
  color: #fff;
  background: linear-gradient(135deg, var(--accent), var(--accent-ink));
  width: 40px; height: 40px;
  display: grid; place-items: center;
  border-radius: 11px;
  flex: 0 0 auto;
}
.brand-text h1 {
  font-size: clamp(19px, 2.4vw, 24px);
  margin: 0;
  letter-spacing: -0.5px;
  font-family: var(--mono);
}
.tagline { margin: 1px 0 0; color: var(--ink-soft); font-size: 13px; }

.theme-toggle {
  display: inline-flex; align-items: center; gap: 7px;
  background: var(--panel); color: var(--ink-soft);
  border: 1px solid var(--border); border-radius: 999px;
  padding: 7px 13px; font-size: 13px; cursor: pointer;
  font-family: var(--sans);
}
.theme-toggle:hover { color: var(--ink); border-color: var(--accent); }
.theme-icon { font-size: 14px; }

/* ---- Layout ---- */
.grid {
  max-width: 1180px;
  margin: 4px auto 0;
  padding: 0 clamp(16px, 4vw, 40px) 20px;
  display: grid;
  gap: 18px;
  grid-template-columns: 1fr;
  align-items: start;
}
@media (min-width: 760px) {
  .grid { grid-template-columns: 1fr 1fr; }
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  box-shadow: 0 1px 2px rgba(10, 20, 40, 0.04);
  min-width: 0;
}
.panel-head {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 10px;
}
.panel-head label, .out-label {
  font-size: 13px; font-weight: 600; letter-spacing: 0.02em;
  text-transform: uppercase; color: var(--ink-faint);
}

.ghost-btn {
  background: transparent; border: 1px solid var(--border);
  color: var(--accent-ink); border-radius: 8px;
  padding: 5px 11px; font-size: 13px; cursor: pointer; font-family: var(--sans);
}
.ghost-btn:hover:not(:disabled) { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 8%, transparent); }
.ghost-btn:disabled { opacity: 0.45; cursor: not-allowed; }
.ghost-btn.copied { color: var(--good-ink); border-color: var(--good-border); }

#input {
  width: 100%;
  min-height: 128px;
  resize: vertical;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--panel-2);
  color: var(--ink);
  padding: 12px;
  font-family: var(--mono);
  font-size: 14.5px;
  line-height: 1.55;
}
#input:focus { outline: 2px solid var(--accent); outline-offset: 1px; border-color: var(--accent); }

.hint { margin: 10px 0 0; font-size: 12.5px; color: var(--ink-faint); }
.mono { font-family: var(--mono); color: var(--ink-soft); }

/* ---- Status badge ---- */
.status {
  display: flex; flex-wrap: wrap; align-items: baseline; gap: 8px;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 12px;
  margin-bottom: 12px;
  background: var(--empty-bg);
}
.badge {
  font-size: 12.5px; font-weight: 700; letter-spacing: 0.02em;
  padding: 2px 9px; border-radius: 999px;
  border: 1px solid var(--empty-border); color: var(--empty-ink);
  background: color-mix(in srgb, var(--empty-ink) 8%, transparent);
  white-space: nowrap;
}
.status-msg { font-size: 13px; color: var(--ink-soft); }

.status-empty { background: var(--empty-bg); border-color: var(--empty-border); }
.status-high { background: var(--good-bg); border-color: var(--good-border); }
.status-high .badge { color: var(--good-ink); border-color: var(--good-border); background: color-mix(in srgb, var(--good-ink) 10%, transparent); }
.status-high .status-msg { color: var(--good-ink); }
.status-caution { background: var(--caution-bg); border-color: var(--caution-border); }
.status-caution .badge { color: var(--caution-ink); border-color: var(--caution-border); background: color-mix(in srgb, var(--caution-ink) 12%, transparent); }
.status-caution .status-msg { color: var(--caution-ink); }
.status-clean { background: var(--clean-bg); border-color: var(--clean-border); }
.status-clean .badge { color: var(--clean-ink); border-color: var(--clean-border); background: color-mix(in srgb, var(--clean-ink) 10%, transparent); }
.status-clean .status-msg { color: var(--clean-ink); }

/* ---- Output ---- */
.output {
  margin: 0;
  min-height: 96px;
  max-height: 260px;
  overflow: auto;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--code-bg);
  color: var(--ink);
  padding: 12px;
  font-family: var(--mono);
  font-size: 14.5px;
  line-height: 1.55;
  white-space: pre-wrap;
  word-break: break-word;
}
.output:focus { outline: 2px solid var(--accent); outline-offset: 1px; }

.notes { margin-top: 10px; }
.note {
  margin: 8px 0 0;
  font-size: 12.8px;
  color: var(--caution-ink);
  background: var(--caution-bg);
  border: 1px solid var(--caution-border);
  border-radius: 8px;
  padding: 8px 10px;
}

.chain { margin-top: 14px; border-top: 1px dashed var(--border); padding-top: 12px; }
.chain-title {
  font-size: 12.5px; font-weight: 600; letter-spacing: 0.02em;
  text-transform: uppercase; color: var(--ink-faint); margin: 0 0 8px;
}
.chain ol { margin: 0; padding-left: 20px; }
.chain li { font-size: 13px; color: var(--ink-soft); margin-bottom: 7px; line-height: 1.5; }

/* ---- Trust ---- */
.trust {
  max-width: 1180px;
  margin: 0 auto;
  padding: 6px clamp(16px, 4vw, 40px) 10px;
  display: flex; align-items: flex-start; gap: 9px;
  font-size: 13px; color: var(--ink-soft);
}
.trust .lock { flex: 0 0 auto; }
#trust-line { max-width: 74ch; }

@media (max-width: 759px) {
  #input { min-height: 96px; }
  .output { min-height: 72px; max-height: 200px; }
}

/* ---- Polyatic footer (graduation addition — matches the page's own brand) ---- */
.site-foot {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 clamp(16px, 4vw, 40px) 34px;
  font-size: 13px;
  color: var(--ink-faint);
}
.site-foot p { margin: 7px 0 0; }
.site-foot a { color: var(--accent-ink); text-decoration-color: var(--border); text-underline-offset: 2px; }
.site-foot a:hover { text-decoration-color: var(--accent); }
.site-foot code {
  font-family: var(--mono);
  font-size: 12.5px;
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1px 6px;
}